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89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
#include <qpdf/QPDF.hh>
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#include <qpdf/QPDFPageDocumentHelper.hh>
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#include <qpdf/QPDFPageObjectHelper.hh>
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#include <qpdf/QPDFWriter.hh>
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#include <qpdf/QUtil.hh>
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#include <cstdlib>
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#include <iostream>
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// This program demonstrates use of form XObjects to overlay a page from one file onto all pages of
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// another file. The qpdf program's --overlay and --underlay options provide a more general version
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// of this capability.
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static char const* whoami = nullptr;
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void
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usage()
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{
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std::cerr << "Usage: " << whoami << " infile pagefile outfile" << std::endl
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<< "Stamp page 1 of pagefile on every page of infile, writing to outfile"
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<< std::endl;
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exit(2);
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}
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static void
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stamp_page(char const* infile, char const* stampfile, char const* outfile)
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{
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QPDF inpdf;
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inpdf.processFile(infile);
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QPDF stamppdf;
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stamppdf.processFile(stampfile);
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// Get first page from other file
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QPDFPageObjectHelper stamp_page_1 = QPDFPageDocumentHelper(stamppdf).getAllPages().at(0);
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// Convert page to a form XObject
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QPDFObjectHandle foreign_fo = stamp_page_1.getFormXObjectForPage();
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// Copy form XObject to the input file
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QPDFObjectHandle stamp_fo = inpdf.copyForeignObject(foreign_fo);
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// For each page...
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for (auto& ph: QPDFPageDocumentHelper(inpdf).getAllPages()) {
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// Find a unique resource name for the new form XObject
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QPDFObjectHandle resources = ph.getAttribute("/Resources", true);
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int min_suffix = 1;
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std::string name = resources.getUniqueResourceName("/Fx", min_suffix);
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// Generate content to place the form XObject centered within destination page's trim box.
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QPDFMatrix m;
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std::string content =
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ph.placeFormXObject(stamp_fo, name, ph.getTrimBox().getArrayAsRectangle(), m);
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if (!content.empty()) {
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// Append the content to the page's content. Surround the original content with q...Q to
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// the new content from the page's original content.
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resources.mergeResources("<< /XObject << >> >>"_qpdf);
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resources.getKey("/XObject").replaceKey(name, stamp_fo);
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ph.addPageContents(inpdf.newStream("q\n"), true);
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ph.addPageContents(inpdf.newStream("\nQ\n" + content), false);
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}
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// Copy the annotations and form fields from the original page to the new page. For more
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// efficiency when copying multiple pages, we can create a QPDFAcroFormDocumentHelper and
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// pass it in. See comments in QPDFPageObjectHelper.hh for details.
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ph.copyAnnotations(stamp_page_1, m);
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}
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QPDFWriter w(inpdf, outfile);
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w.setStaticID(true); // for testing only
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w.write();
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}
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int
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main(int argc, char* argv[])
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{
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whoami = QUtil::getWhoami(argv[0]);
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if (argc != 4) {
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usage();
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}
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char const* infile = argv[1];
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char const* stampfile = argv[2];
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char const* outfile = argv[3];
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try {
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stamp_page(infile, stampfile, outfile);
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} catch (std::exception& e) {
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std::cerr << whoami << ": " << e.what() << std::endl;
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exit(2);
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}
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return 0;
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}
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